The humidity ratio of atmospheric air at 28°c dry bulb temperature and 760 mm of mercury is 0.016 kg /kg of dry air. determine: 1. partial pressure of water vapour ; 2. relative humidity ; 3. dew point temperature; 4. specific enthalpy; and 5. vapour densiy.

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.